1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 /* 19 * $Id: Equals.java 468655 2006-10-28 07:12:06Z minchau $ 20 */ 21 package org.apache.xpath.operations; 22 23 import org.apache.xpath.XPathContext; 24 import org.apache.xpath.objects.XBoolean; 25 import org.apache.xpath.objects.XObject; 26 27 /** 28 * The '=' operation expression executer. 29 */ 30 public class Equals extends Operation 31 { 32 static final long serialVersionUID = -2658315633903426134L; 33 34 /** 35 * Apply the operation to two operands, and return the result. 36 * 37 * 38 * @param left non-null reference to the evaluated left operand. 39 * @param right non-null reference to the evaluated right operand. 40 * 41 * @return non-null reference to the XObject that represents the result of the operation. 42 * 43 * @throws javax.xml.transform.TransformerException 44 */ operate(XObject left, XObject right)45 public XObject operate(XObject left, XObject right) 46 throws javax.xml.transform.TransformerException 47 { 48 return left.equals(right) ? XBoolean.S_TRUE : XBoolean.S_FALSE; 49 } 50 51 /** 52 * Execute a binary operation by calling execute on each of the operands, 53 * and then calling the operate method on the derived class. 54 * 55 * 56 * @param xctxt The runtime execution context. 57 * 58 * @return The XObject result of the operation. 59 * 60 * @throws javax.xml.transform.TransformerException 61 */ bool(XPathContext xctxt)62 public boolean bool(XPathContext xctxt) 63 throws javax.xml.transform.TransformerException 64 { 65 XObject left = m_left.execute(xctxt, true); 66 XObject right = m_right.execute(xctxt, true); 67 68 boolean result = left.equals(right) ? true : false; 69 left.detach(); 70 right.detach(); 71 return result; 72 } 73 74 } 75